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author | Gerald Combs <gerald@wireshark.org> | 2013-12-10 19:23:26 +0000 |
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committer | Gerald Combs <gerald@wireshark.org> | 2013-12-10 19:23:26 +0000 |
commit | 17a67c3b5cb80619ab7e1260a05a28e888cee09e (patch) | |
tree | 538f734525e8a488e4fc60ad4eff509a80458c8f /ui/decode_as_utils.c | |
parent | 5fa7d37e377abb89e317f4ebd47ebea69ebe0fd9 (diff) | |
download | wireshark-17a67c3b5cb80619ab7e1260a05a28e888cee09e.tar.gz |
Get the "Decode As" dialog working, albeit with a few warts. It differs
from the GTK flavor in two major ways:
- The "Decode As" and "User Specified Decodes" dialog have been unified.
- You can modify the decode as behavior at any time, not just when you
have a packet selected.
Revert part of 53498 so that we can move items marked
/*** THE FOLLOWING SHOULD NOT BE USED BY ANY DISSECTORS!!! ***/
from epan/decode_as.h to ui/decode_as_utils.h.
Move "save" code from decode_as_dlg.c to decode_as_utils.c as well.
In packet-dcerpc.c don't register a table named "ethertype". We might
want to add checks for duplicate table names.
To do:
- Add support for ranges?
- Either add support for DCERPC or make DCERPC use a regular dissector
table.
- Fix string selectors (i.e. BER).
svn path=/trunk/; revision=53910
Diffstat (limited to 'ui/decode_as_utils.c')
-rw-r--r-- | ui/decode_as_utils.c | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/ui/decode_as_utils.c b/ui/decode_as_utils.c new file mode 100644 index 0000000000..d78c5d8dde --- /dev/null +++ b/ui/decode_as_utils.c @@ -0,0 +1,294 @@ +/* decode_as_utils.c + * + * $Id$ + * + * Routines to modify dissector tables on the fly. + * + * By David Hampton <dhampton@mac.com> + * Copyright 2001 David Hampton + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ +#include "config.h" + +#include <stdlib.h> + +#include <stdio.h> +#include <errno.h> + +#include "epan/decode_as.h" +#include "epan/packet.h" +#include "epan/prefs.h" +#include "epan/prefs-int.h" + +#include "epan/dissectors/packet-dcerpc.h" + +#include "ui/decode_as_utils.h" +#include "ui/simple_dialog.h" + +#include "wsutil/file_util.h" +#include "wsutil/filesystem.h" + +#include "version_info.h" + +/* + * A list of dissectors that need to be reset. + */ +static GSList *dissector_reset_list = NULL; + +/* + * Data structure used as user data when iterating dissector handles + */ +typedef struct lookup_entry { + gchar* dissector_short_name; + dissector_handle_t handle; +} lookup_entry_t; + +/* + * Data structure for tracking which dissector need to be reset. This + * structure is necessary as a hash table entry cannot be removed + * while a g_hash_table_foreach walk is in progress. + */ +typedef struct dissector_delete_item { + /* The name of the dissector table */ + const gchar *ddi_table_name; + /* The type of the selector in that dissector table */ + ftenum_t ddi_selector_type; + /* The selector in the dissector table */ + union { + guint sel_uint; + char *sel_string; + } ddi_selector; +} dissector_delete_item_t; + +/* + * A callback function to changed a dissector_handle if matched + * This is used when iterating a dissector table + */ +static void +change_dissector_if_matched(gpointer item, gpointer user_data) +{ + dissector_handle_t handle = (dissector_handle_t)item; + lookup_entry_t * lookup = (lookup_entry_t *)user_data; + if (strcmp(lookup->dissector_short_name, dissector_handle_get_short_name(handle)) == 0) { + lookup->handle = handle; + } +} + +/* + * A callback function to parse each "decode as" entry in the file and apply the change + */ +static prefs_set_pref_e +read_set_decode_as_entries(gchar *key, const gchar *value, + void *user_data _U_, + gboolean return_range_errors _U_) +{ + gchar *values[4] = {NULL, NULL, NULL, NULL}; + gchar delimiter[4] = {',', ',', ',','\0'}; + gchar *pch; + guint i, j; + dissector_table_t sub_dissectors; + prefs_set_pref_e retval = PREFS_SET_OK; + gboolean is_valid = FALSE; + + if (strcmp(key, DECODE_AS_ENTRY) == 0) { + /* Parse csv into table, selector, initial, current */ + for (i = 0; i < 4; i++) { + pch = strchr(value, delimiter[i]); + if (pch == NULL) { + for (j = 0; j < i; j++) { + g_free(values[j]); + } + return PREFS_SET_SYNTAX_ERR; + } + values[i] = g_strndup(value, pch - value); + value = pch + 1; + } + sub_dissectors = find_dissector_table(values[0]); + if (sub_dissectors != NULL) { + lookup_entry_t lookup; + lookup.dissector_short_name = values[3]; + lookup.handle = NULL; + ftenum_t selector_type = dissector_table_get_type(sub_dissectors); + g_slist_foreach(dissector_table_get_dissector_handles(sub_dissectors), + change_dissector_if_matched, &lookup); + if (lookup.handle != NULL || g_ascii_strcasecmp(values[3], DECODE_AS_NONE) == 0) { + is_valid = TRUE; + } + + if (is_valid) { + if (selector_type == FT_STRING || selector_type == FT_STRINGZ) { + dissector_change_string(values[0], values[1], lookup.handle); + } else { + dissector_change_uint(values[0], atoi(values[1]), lookup.handle); + } + decode_build_reset_list(g_strdup(values[0]), selector_type, + g_strdup(values[1]), NULL, NULL); + } + } else { + retval = PREFS_SET_SYNTAX_ERR; + } + + } else { + retval = PREFS_SET_NO_SUCH_PREF; + } + + for (i = 0; i < 4; i++) { + g_free(values[i]); + } + return retval; +} + +void +load_decode_as_entries(void) +{ + char *daf_path; + FILE *daf; + + if (dissector_reset_list) { + decode_clear_all(); + } + + daf_path = get_persconffile_path(DECODE_AS_ENTRIES_FILE_NAME, TRUE); + if ((daf = ws_fopen(daf_path, "r")) != NULL) { + read_prefs_file(daf_path, daf, read_set_decode_as_entries, NULL); + fclose(daf); + } + g_free(daf_path); +} + +void +decode_build_reset_list (const gchar *table_name, ftenum_t selector_type, + gpointer key, gpointer value _U_, + gpointer user_data _U_) +{ + dissector_delete_item_t *item; + + item = g_new(dissector_delete_item_t,1); + item->ddi_table_name = table_name; + item->ddi_selector_type = selector_type; + switch (selector_type) { + + case FT_UINT8: + case FT_UINT16: + case FT_UINT24: + case FT_UINT32: + item->ddi_selector.sel_uint = GPOINTER_TO_UINT(key); + break; + + case FT_STRING: + case FT_STRINGZ: + item->ddi_selector.sel_string = (char *)key; + break; + + default: + g_assert_not_reached(); + } + dissector_reset_list = g_slist_prepend(dissector_reset_list, item); +} + +/* clear all settings */ +void +decode_clear_all(void) +{ + dissector_delete_item_t *item; + GSList *tmp; + + dissector_all_tables_foreach_changed(decode_build_reset_list, NULL); + + for (tmp = dissector_reset_list; tmp; tmp = g_slist_next(tmp)) { + item = (dissector_delete_item_t *)tmp->data; + switch (item->ddi_selector_type) { + + case FT_UINT8: + case FT_UINT16: + case FT_UINT24: + case FT_UINT32: + dissector_reset_uint(item->ddi_table_name, + item->ddi_selector.sel_uint); + break; + + case FT_STRING: + case FT_STRINGZ: + dissector_reset_string(item->ddi_table_name, + item->ddi_selector.sel_string); + break; + + default: + g_assert_not_reached(); + } + g_free(item); + } + g_slist_free(dissector_reset_list); + dissector_reset_list = NULL; + + decode_dcerpc_reset_all(); +} + +/* XXX - We might want to switch this to a UAT */ +FILE * +decode_as_open() { + char *pf_dir_path; + char *daf_path; + FILE *da_file; + + if (create_persconffile_dir(&pf_dir_path) == -1) { + simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, + "Can't create directory\n\"%s\"\nfor recent file: %s.", pf_dir_path, + g_strerror(errno)); + g_free(pf_dir_path); + return NULL; + } + + daf_path = get_persconffile_path(DECODE_AS_ENTRIES_FILE_NAME, TRUE); + if ((da_file = ws_fopen(daf_path, "w")) == NULL) { + simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, + "Can't open decode_as_entries file\n\"%s\": %s.", daf_path, + g_strerror(errno)); + g_free(daf_path); + return NULL; + } + + fputs("# \"Decode As\" entries file for Wireshark " VERSION ".\n" + "#\n" + "# This file is regenerated each time \"Decode As\" preferences\n" + "# are saved within Wireshark. Making manual changes should be safe," + "# however.\n", da_file); + + return da_file; +} + +/* XXX We might want to have separate int and string routines. */ +void +decode_as_write_entry(FILE *da_file, const char *table_name, const char *selector, const char *default_proto, const char *current_proto) { + fprintf (da_file, + DECODE_AS_ENTRY ": %s,%s,%s,%s\n", + table_name, selector, default_proto, current_proto); +} + + +/* + * Editor modelines + * + * Local Variables: + * c-basic-offset: 4 + * tab-width: 8 + * indent-tabs-mode: nil + * End: + * + * ex: set shiftwidth=4 tabstop=8 expandtab: + * :indentSize=4:tabSize=8:noTabs=true: + */ + |